That’s such a relief after having a dismal flop two days ago. I was scratching my head.
I wanted an easy to set up one pull rope or a rope toss to pull up an antenna and got interested in the Km4ACK design. Multibands, no tuner on 10, 15, 20, and 40,....add 80 if you add wire. I wanted to get just to 40m and higher bands.
I wanted to keep it fairly light and compact and have it on a winder. I cut a Dollar General plastic cutting board into three pieces. Kept the one with a handle hole for the end fed winder. I used a single fair rite 140-43 toroid and wrapped 16 ga magnet wire 3:21. used a plastic Barnes Bullets box to hold the toroid, the BNC female socket, a blue high voltage 100 Pf capacitor, and the stainless steel antenna and ground studs. My studs were cap head bolts that did double duty holding the box to the winder. Washers, hex nut and wing nut to finish.
I had a chance to test it the first time the other day and it was a flop. Before testing I caught one mistake, my toroid wrapping 3:21,.....I wrapped three double like I was supposed to then wrapped 21 more turns.
. My quickie fix was to unwrap the three last wraps leaving it asymmetrical figuring electrically it should be fine.
Spent a fair amount of time looking for my Rig Expert.
. By the time I got set up I didn’t have too much time. Rigged up as a sloper with the high side about 24’ up in a tree (actually short of the tree, the pull rope went over it. Ran the Rig Expert and got mostly very high SWR 12-15 and just two deep dips no where useful. First wire was 31’, second wire was 51’ iirc grabbed from reported good length list. Not really any improvement, tried several counter poises ( KM4ACK design I don’t thing shows a counterpoise provision on his, but hey I used two bolts to attach my unun box! That didn’t seem to help. Called it quits after trimming wire and not getting anything that looked right.
Had a nasty rain day to go over things. Took the unun apart and rewrapped it symetrically. I really didn’t want a wire that long but figured I’d try the KM4MACK length of 67’,...actually started a lot longer seeing the optimal ranges some people listed.
Edit because I accidentally submitted before I was done.
Did some more research and picked up on the general opinion you really may need a common mode choke at the rig. So i put ten turns of my 35’ rg58 coax into a 31 mix snap on ferrite.
Today’s session went much, much better, got a bunch of dips that made more sense for a multi bander. Took my time and folded back wire, recheck it, snip off folded part, recheck, fold back again, test, snip the folded part, recheck, ad naseum until I got the 40m tuned.and around 2.0:1 swr, 20m, 15m were very good close to 1:1 and 10m was very usable with only the high end getting above 3:1. Playing with counterpoise length brought it down more. on 10m.
So now I got a home made end fed antenna that works at least in that set up.